Xojo Blog Posts

Often in our projects we need to apply some kind of validation of the user input so we get the data we are expecting. For example, getting a valid email addresses or URL. I want to share with you a couple of String Class extensions you can use to validate whether the user typed a valid email or URL, this is not a silver bullet (there are always exceptions), but it can you save you some time now and in future projects.

All of us are used to dealing with that web form where we select a country from a long, long list of more than 200 hundred countries. It would certainly be more useful, less stressful and a better usability practice to preselect the country name from the IP of the client visitor. Continue reading to learn how you can put a bit of intelligence into your web forms using a WebPopupMenu subclass.

The singleton design pattern has its place in the desktop environment where there will be only one user running the application, and when that user quits the app the singleton is destroyed. This doesn’t fit the requirements of a multi-user environment such as the web where many users will be accessing the application at once. I recently came across this issue when porting a desktop app to the web which required me to design a singleton class that is session sensitive. Here’s a walk through of how I achieved my goal. Please note that scopes are particularly important when creating this class.

We often get questions from newcomers about how Xojo licenses work and what license options available. Read on to learn what Xojo license is right for your needs. At the end, if you still aren’t sure what license is right for you, you can get in touch with us and we’ll help you get what you need.